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There is nothing strange with that. The CPU has 2 serial ports. One of them is used for feeding the mas (playback), the other is used for the remote control on jukeboxes. However, this is needed for MMC access on the Ondio, so I have to disable all remotre control code for it.

It's interesting as well that the Archos and iPod both used a serial interface for the remote, whereas the IHP uses another resistor ladder. I spent quite a while with a logic analyzer being confused about how it worked.

You should definitely scope out the main unit buttons though. I'm much more confident about the remote's function since I've ohmed it out. It does look to me, however that at least in some cases the same function gets used for both sets of buttons, with only the ADC mux index as an argument. This may leave the possibility that the Play button on the main unit is also separate.

I actually never checked the value of RS. At the time I hadn't opened my IHP yet, and any voltage measurement I made at the remote end (which I did have open) would include some assumptions of VP which I also do not know.

Zagor: I once wanted to add grayscale to the sim, but then found that the x11 sim (unlike the win32 sim) doesn't use a bitmap, but sets/resets individual pixels. I see no way to do it without the x11 sim being changed to use a bitmap too.